I love figuring out ways to save money & have a new-found favorite way. For Christmas I received a couple bottles of foaming hand soap, and they are always my favorite, and my kids love them, too. I have learned that they feel like they are getting a lot more "soap" with the foaming soap than they do with regular hand soap, and even though they use it ALL THE TIME (not just after using the potty) it lasts a lot longer than its non-foaming counterpart. Well, today I found one of the bottles empty, but rather than throwing it away, I looked online and found out that you can use any liquid soap or shampoo in the bottle if you thin it down to 1 part soap 5 parts water. Oh, yeah! I tried it and it works GREAT! Now, I have a nearly unlimited supply of soap for my girls without having to spend a fortune to keep soap in the bathrooms. How cool is that?!